It costs a lot of money to buy yourself onto a climb on Everest.
2016 average figures for a guided ascent with Sherpa guide (all inclusive gear, transport, permit etc.) suggest $44000 and $62000 if you want a Western guide.
That is trivial compared to the cost of a large-scale DXpedition for DXCC chasers. For example, the budget for the 2014 Amsterdam Island DXpedition (FT5ZM) was $400,000 - not including the cost of operator air fares to Perth and back.
Sorry, its just the phrasing used, I am over analyzing sentences at the moment to mean possibly different things. Expense in terms of effort rather than money.
That was $400000 for 14 people or $28500 plus fares to Perth. I can buy a return flight to Perth from Edinburgh for £1100 right now and booking ahead drops that to £700.
Of course you are quite likely to come back alive from FT5 and with the same number of fingers and toes as you left with!
Perhaps this whole thread could be the basis of a question or three about how hard “real” mountain climbing is, for Emil DL8JJ at Friedrichshafen next month?